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1  Using Arduino / Networking, Protocols, and Devices / Nrf24l01+ with PA current consumption on: January 21, 2013, 01:26:12 pm
Hi! I've been successfully using nrf24l01 antennas for some time. At the moment I am making low power node, which consists of atmega328P (with arduino bootloader), nrf24l01+ antenna and temperature/humidity sensor (DHT22). Everything works perfect but I have a problem with current draw. If i use nrf24l01+ without amplifier, current consumption in sleep mode is few uA. But when I change antenna and use nrf24l01+ with PA, current consumption is 6 mA.

So my question is, is there any way to lower drawn current when using antenna with PA or do I have to use antenna without amplifier? I am using RF24 library and I turn off the radio before putting AVR in sleep mode. Everything in the above scenario is the same, I only use different antennas (with or without amplifier).

Just to be clear, this is the antenna with PA: http://www.ebay.com/itm/nRF24L01-Wireless-Transceiver-Module-PA-SMA-Antenna-MAX-distance-up-to-1KM-/160822596423?pt=LH_DefaultDomain_0&hash=item2571c61347

And this is the antenna without PA: http://www.ebay.com/itm/2pcs-2-4GHz-NRF24L01-Antenna-Wireless-Transceiver-Module-For-Microcontrol-/370736445804?pt=LH_DefaultDomain_0&hash=item56519d396c
2  Using Arduino / Displays / Re: Mega 2560 with ST7920 LCD and u8glib problem on: October 05, 2012, 03:10:29 am
I've been testing this for the past two days and now LCD worked fine everytime after first reset. The point is, if arduino is not connected to the power source, the screen usually doesn't work when I plug it in. After first reset, it is back to normal. I have to check what happens when it is turned on for a longer time.
Regarding your post, I would say there could be something with the init sequence...

LCD is in serial mode.

here you can see, what happens after powering the arduino on. Sometimes these characters are covering all the screen, not just part of it...

3  Using Arduino / Displays / Mega 2560 with ST7920 LCD and u8glib problem on: October 04, 2012, 08:53:10 am
I bought 128x64 LCD with ST7920 controller from China. It is connected to arduino Mega, but there is a problem, which I dont know how to solve. I am using U8glib and sometimes everything works fine, but sometimes there are displayed some stripes or random characters. At first I thougt there is a problem with wires, but now it seems something else is causing this.
Usually after first boot (when I disconnect the power), the screen is full of some "chinese" characters. Reseting the arduino usually solves this, but sometimes I have to reset the microcontroller many times. A have replaced the wires and changed data PINs (3 cables), but nothing changed. Now I ran out of ideas and I would really appreciate your help.
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